Valve position calibration method, device and system and storage medium

Abstract

The embodiment of the invention provides a valve position calibration method, device and system and a storage medium, which relate to the field of valve positioner control. The method comprises the steps that after stroke calibration is started, a corner value collected by an angle sensor when a valve rod moves to a stroke middle point is obtained and serves as a middle corner value; the intelligent valve positioner is controlled to carry out air intake until the valve rod does not move any more, and the position where the valve rod does not move any more in the air intake state is determined as the stroke top end; a corner value acquired by the angle sensor when the valve rod is located at the top end of the stroke is obtained as a top corner value; the intelligent valve positioner is controlled to exhaust until the valve rod does not move any more, and the position where the valve rod does not move any more in the exhaust state is determined as the stroke bottom end; a corner value collected by the angle sensor when the valve rod is located at the stroke bottom end is obtained as a bottom end corner value; if the corner values of the middle end, the top end and the bottom end are obtained, it is determined that stroke calibration is completed. Thus, the control precision of the valve can be improved.

Description

technical field [0001] The invention relates to the field of valve positioner control, in particular to a valve position calibration method, device, system and storage medium. Background technique [0002] In industrial development, valve positioners can assist regulating valves to achieve flow control and play an important role. When the valve positioner controls the linear actuator, due to the non-linear relationship between the stroke of the valve stem and the rotation angle of the connecting rod, the regulating valve often cannot be adjusted to the preset position according to the demand. [0003] The existing method of calibrating the valve position greatly depends on the user's own experience, and there are certain on-site installation requirements, such as requiring the valve stem to be perpendicular to the connecting rod when the valve stem is in the middle position. [0004] If the conditions of on-site installation do not meet the requirements, or the user makes a...

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Problems solved by technology

[0004] If the conditions of on-site installation do not meet the requirements, or the user makes a mistake in his own judgment, there will be a large error in the correction, and there are certain limitations.

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